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. Author manuscript; available in PMC: 2015 Aug 24.
Published in final edited form as: Clin Cancer Res. 2013 Sep 27;19(23):6338–6343. doi: 10.1158/1078-0432.CCR-13-0614

Figure 1.

Figure 1

The green curve shows the depth dose data of a typical 15 MV photon beam. The red curve shows the depth dose curve of a monoenergetic proton beam. The maximum dose point of this curve is termed the Bragg peak. Scanning thin monoenergetic proton beams are used for intensity-modulated proton therapy. The cyan curve is obtained by electromechanically spreading the monoenergetic proton beam laterally and longitudinally and is used in passively scattered proton therapy. The top flat portion of this curve is called the spread-out Bragg peak. The potential advantages of proton vs. photon dose distributions are clear.